The average weight of 12 articles is 18 kg. Addition of another new article reduces the average weight by 500g. What is the weight of the new article?
Answer & explanation
Correct answer: option 1
Sum of weight of 12 articles = 12 × 18 = 216 kg
By adding 1 new article , New average = 17.5 kg
Sum of weight of 13 articles = 13 × 17.5 = 227.5 kg
Weight of new article = 227.5 - 216 = 11.5 kg